Using `ILoggerFactory` in MvvmCross involves integrating logging capabilities into your cross-platform application. MvvmCross, starting from version 8, utilizes the `Microsoft.Extensions.Logging` framework for logging, which provides a flexible and extensible logging system. Here's a detailed example of how to use `ILoggerFactory` in an MvvmCross application:
Overview of Logging in MvvmCross 8
In MvvmCross 8, logging is based on the `Microsoft.Extensions.Logging` framework. This framework allows you to use various logging providers like Serilog, Console, or even custom providers. To set up logging, you need to implement two key methods in your `Setup` class: `CreateLogProvider` and `CreateLogFactory`.
Implementing Logging in the Setup Class
To use `ILoggerFactory`, you first need to create a `Setup` class that inherits from `MvxAndroidSetup` (for Android), `MvxWpfSetup` (for WPF), or similar setup classes for other platforms. In this class, you override the methods to create a log provider and a log factory.
Here's an example for Android:
csharp
using Microsoft.Extensions.Logging;
using MvvmCross.Platforms.Android.Core;
using Serilog;
using Serilog.Events;
namespace YourApp.Droid
{
public class Setup : MvxAndroidSetup
{
protected override ILoggerProvider CreateLogProvider()
{
// Configure Serilog as the logging provider
Log.Logger = new LoggerConfiguration()
.MinimumLevel.Debug()
// Add more sinks here, e.g., console, file, etc.
.CreateLogger();
return new SerilogLoggerProvider();
}
protected override ILoggerFactory CreateLogFactory()
{
// Create a Serilog logger factory
return new SerilogLoggerFactory();
}
}
}
Using ILoggerFactory in ViewModels
Once you have set up the logging infrastructure, you can inject `ILoggerFactory` into your view models or services to create loggers as needed.
Here's how you might use it in a view model:
csharp
using Microsoft.Extensions.Logging;
namespace YourApp.Core.ViewModels
{
public class MyViewModel : MvxViewModel
{
private readonly ILogger _logger;
public MyViewModel(ILoggerFactory loggerFactory)
{
// Create a logger for this view model
_logger = loggerFactory.CreateLogger(GetType().Name);
}
public void SomeMethod()
{
_logger.LogInformation("SomeMethod was called.");
}
}
}
Benefits of Using ILoggerFactory
Using `ILoggerFactory` allows you to dynamically create loggers with specific categories, which is useful for organizing logs by class or feature. This approach also enables you to switch between different logging providers without changing your application code, as long as they implement the `ILoggerProvider` interface.
Conclusion
In summary, using `ILoggerFactory` in MvvmCross involves setting up a logging provider and factory in your application's setup class and then injecting the factory into your view models or services to create loggers as needed. This approach provides flexibility and extensibility in managing logs across your cross-platform application.
Citations:[1] https://www.mvvmcross.com/documentation/fundamentals/logging-new
[2] https://www.mvvmcross.com/documentation/upgrading/upgrade-to-mvvmcross-80
[3] https://learn.microsoft.com/en-us/dotnet/core/extensions/logging-library-authors
[4] https://www.mvvmcross.com/logging
[5] https://github.com/MvvmCross/MvvmCross-Samples/blob/master/StarWarsSample/StarWarsSample.Core/Logs.cs
[6] https://learn.microsoft.com/en-us/dotnet/core/extensions/logging
[7] https://www.mvvmcross.com/documentation/tutorials/tipcalc/a-wpf-ui-project
[8] https://www.mvvmcross.com/documentation/getting-started/mvvmcross-overview
[9] https://blog.rsuter.com/logging-with-ilogger-recommendations-and-best-practices/
[10] https://stackoverflow.com/questions/68075159/mvvm-cross-logging-setup-class
[11] https://www.mvvmcross.com/documentation/tutorials/tipcalc/a-xamarinandroid-ui-project